Desactivar clic derecho CSS

/*desactivar clic derecho*/
img {
user-drag: none;
-moz-user-drag: none;
-khtml-user-drag: none;
-webkit-user-drag: none;
user-select: none;
-moz-user-select: none;
-khtml-user-select: none;
-webkit-user-select: none; }
/*termina desactivar clic derecho*/